<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加区域  -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格区域 -->
      <el-table
        :data="catelist"
        style="width: 100%; margin-bottom: 20px"
        row-key="cat_id"
        border
      >
        <el-table-column label="分类名称" prop="cat_name"> </el-table-column>
        <el-table-column label="是否有效">
          <template slot-scope="scope">
            <i
              v-if="scope.row.cat_deleted === false"
              class="el-icon-success"
              style="color: green"
            ></i>
            <i v-else class="el-icon-error" style="color: red"></i>
          </template>
        </el-table-column>
        <el-table-column label="排序" sortable>
          <template slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
            <el-tag
              size="mini"
              v-else-if="scope.row.cat_level === 1"
              type="success"
              >二级</el-tag
            >
            <el-tag size="mini" v-else type="warning">三级</el-tag>
          </template>
        </el-table-column>
        <el-table-column label="操作">
          <template>
            <el-button size="mini" type="primary" icon="el-icon-sedit"
              >编辑</el-button
            >
            <el-button size="mini" type="danger" icon="el-icon-delete"
              >删除</el-button
            >
          </template>
        </el-table-column>
      </el-table>

      <!-- 分页区域 -->
      <!-- 底部分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[1, 2, 5, 10]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 内容区域 -->
      <el-form
        :model="addCateForm"
        :rules="addCateRules"
        label-width="100px"
        ref="addCateFormRef"
      >
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <!-- 底部按钮区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      querInfo: {
        type: 3,
        // 当前的页数
        pagenum: 1,
        // 当前每页显示几条
        pagesize: 5,
      },
      // 商品分类列表，默认为空
      catelist: [],
      total: 0,
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0,
      },
      addCateRules: {
        cate_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
          {
            min: 3,
            max: 10,
            message: '长度在 3 到 10 个字符',
            trigger: 'blur',
          },
        ],
      },
      parentCateList: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
        checkStrictly: 'true',
      },
      selectedKeys: [],
    }
  },

  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get(`categories`, {
        params: this.querInfo,
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
      // console.log(res.data)
    },

    // 监听 pagesize 改变
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize
      this.getCateList()
    },

    // 监听 pagenum 改变
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级商品分类数据
    async getParentCateList() {
      const { data: res } = await this.$http.get(`categories`, {
        params: { type: 2 },
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败')
      }
      this.parentCateList = res.data
      // console.log(res.data)
    },
    // 父级分类改变
    parentCateChange() {
      console.log(this.selectedKeys)

      if (this.selectedKeys.length > 0) {
        // 父级分类 ID
        this.addCateForm.cat_pid =
          this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },

    // 点击按钮，添加新的分类
    addCate() {
      console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
          if (res.meta.status !== 201) {
        return this.$message.error('添加分类失败')
      }
      this.$message.success('添加分类成功')
      this.getCateList()
      this.addCateDialogVisible = false
      })
    },
    // 监听对话框关闭，重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
  },
}
</script>

<style scoped>
</style>